select multiple rows from uitableview and delete - iphone

Question

i am displaying a list of items in a tableview.i need to select and delete multiple rows from the table at a time,any resources on how to do this

Answer 1

I'm assuming your table has just one section. You can extend this solution to multiple sections fairly easily.
Add an NSMutableSet member "selectedRows" to your UIViewController subclass that manages your TableView
in - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath toggle the indexPath.row's membership in "selectedRows", like this:
NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:indexPath.row];
if ( [self.selectedRows containsObject:rowNsNum] )
[self.selectedRows removeObject:rowNsNum];
else
[self.selectedRows addObject:rowNsNum];
indicate visually that a row is selected (e.g., set the cell's accessoryType property to UITableViewCellAccessoryCheckmark), or modify your cell visually in some other way to indicate that it is a selected row
add a "delete" button to your UI, either in a table section header/footer, your title bar, anywhere, hooked up to a selector called "deleteRows"
in your deleteRows method, iterate through the selectedRows set, building up an array of indexPaths, delete these rows from your data model, then call (with your preferred animation type):
[self.myTableView deleteRowsAtIndexPaths:arrayOfIndexPathsToDelete withRowAnimation:UITableViewRowAnimationTop];
EDIT:
Here's my full didSelectRowAtIndexPath method. The deselectRowAtIndexPath may be required for correct operation.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if ( self.editing )
return;
[self.myTableView deselectRowAtIndexPath:indexPath animated:YES];
NSNumber *rowNsNum = [NSNumber numberWithUnsignedInt:indexPath.row];
if ( [self.selectedRows containsObject:rowNsNum] )
[self.selectedRows removeObject:rowNsNum];
else
[self.selectedRows addObject:rowNsNum];
[self.myTableView performSelector:#selector(reloadData) withObject:nil afterDelay:0.2];
}

Answer 2

#import "ViewController.h"
#import "TableViewCell.h"
#interface ViewController ()
#property (weak, nonatomic) IBOutlet UITableView *tblView;
#property (strong,nonatomic)NSMutableArray *arryData1,*arryData2;
#property (strong,nonatomic)UIBarButtonItem *edit,*delete;
#end
#implementation ViewController
{
BOOL Selected;
}
- (void)viewDidLoad {
[super viewDidLoad];
self.arryData1 = [[NSMutableArray alloc] initWithObjects:#"MCA",#"MBA",#"BTech",#"MTech",nil];
self.arryData2 = [[NSMutableArray alloc] initWithObjects:#"Objective C",#"C++",#"C#",#".net",nil];
self.edit=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemEdit target:self action:#selector(edit:)];
self.navigationItem.leftBarButtonItem=self.edit;
self.delete=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemTrash target:self action:#selector(delete:)];
self.navigationItem.rightBarButtonItem=self.delete;
self.tblView.allowsMultipleSelection=YES;
}
-(void)edit:(id)sender
{
Selected=YES;
[self.tblView reloadData];
}
-(void)delete:(id)sender
{
NSArray *selectedCells = [self.tblView indexPathsForSelectedRows];
NSMutableIndexSet *indicesToDelete = [[NSMutableIndexSet alloc] init];
for (NSIndexPath *indexPath in selectedCells) {
[indicesToDelete addIndex:indexPath.row];
}
//arrayFromPlist is NSMutableArray
[self.arryData1 removeObjectsAtIndexes:indicesToDelete];
[self.tblView beginUpdates];
[self.tblView deleteRowsAtIndexPaths:selectedCells withRowAnimation:UITableViewRowAnimationAutomatic];
[self.tblView endUpdates];
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
// Remove the row from data model
[self.arryData1 removeObjectAtIndex:indexPath.row];
}
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.arryData1 count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier= #"Cell";
TableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] ;
}
if (Selected==YES) {
cell.imageView.image=[UIImage imageNamed:#"trash.png"];
}
else
{
cell.imageView.image=nil;
}
cell.textLabel.text = [self.arryData1 objectAtIndex:indexPath.row];
cell.detailTextLabel.text = [self.arryData2 objectAtIndex:indexPath.row];
return cell;
}
#end